ref: 88ee8a190d82bf4bc7967ea3c829a2481c814d56
dir: /win32/genversion.bat/
@echo off
setlocal enableextensions enabledelayedexpansion
for /f %%v in ('git describe --tags --match "v*"') do set version=%%v
if not "%version%"=="" goto :gotversion
if exist "%~dp0..\version.mk" goto :getversion
echo Git cannot be found, nor can version.mk. Generating unknown version.
set version=unknown
goto :gotversion
:getversion
for /f "delims== tokens=2" %%v in (%~dp0..\version.mk) do set version=%%v
set version=!version:^"=!
set version=!version: =!
:gotversion
set version_out=#define %2 "%version%"
set version_mk=%2 = "%version%"
echo %version_out%> %1_temp
if %version%==unknown goto :skipgenerate
echo %version_mk%> "%~dp0..\version.mk"
:skipgenerate
echo n | comp %1_temp %1 > NUL 2> NUL
if not errorlevel 1 goto exit
copy /y %1_temp %1
:exit
del %1_temp